Computing device.



A. H. HORNBOSTEL & J. H. GROSW'HITE.

COMPUTING DEVICE. APPLICATION FILED DEC. 14, 1912.

Patented Sept. 30, 1913.

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COMPUTING DEVICE.

APPLICATION FILED DEO.14, 1912.

Patented Sept. 30, 1913.

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AIDGfib-PH E. 6', HGBNBOfi'lEL AND JAMES H, CEQSWHITE, F WAVBRLY, MISSOURI.

WMEUTING- DEVICE.

accesses a; all whom it may concern;

Be it known that We, ADoLrH H. v C. HDBNBOSIEL and JAMES H. Cnoswrrrrm, citizens of the United States, residing at VVaverly, in the county of Lafayette and State of Missouri, have invented certain new and useful improvements in Computing Devices,

out iich the foiiowing is a specification,

rehirence being had to the accompanying drawings,

This invention reiates to computing demore particularly to that class in which the number of days from a date in one month to certain date in another month may be quickly and easily determined,-

An objectoi this invention is the provision of a computing device comprising a pair of disks, the disks being suitably lettered and numbered so that the number of days from a date in one month to a date in another month inay be easily determined.

Pa further object of this invention is the provision of a computing device of this character compiising' a spindle on which is rotatably mounted a disk having 21 peripheral flange, and a second disk rota tably mounted on the spindle within the flange of the first mentioned disk, a ring v 1 a front el ration oi vice; Fig. 2 is a side elevation 3 is a vertical'section; enlarged detail section, and l tion taken on the line 5-oi of fig. a

Referring mare particularly to the draw:- ing, the numeral 1 designates a base whi h is formed With a standa d ard being formed c a ia exng spindle or shaft 3. .L abiy ted on the shaft near the inner end Specification of Letters Patent,

Kpp'lication filed hecembe'r M, 1912. Serial No. 736,868.

Poten-ted Sept. 30, 1913.

thereof, is an annular plate or disk 4 which is provided, with a laterally extending flange 5, the disk 4 being prevented from lateral movement on the shaftby means of plates 6 keyed to the shaft on the opposite sides of the disk. Mounted on the shaft 3 near the outer end thereof is a disk 7, movement of the disk inwardly on the shaft being limited by a plate 8 which is keyed thereon, The disk 7 is formed With an oliset peripheral flange 9, which is adapted to bear against a ring 10, which is secured to the outer edge of the flange 5 by bolts 11 or other suitable fastening devices. The inner peripheral edge of the ring is adapted to engage the shoulder 12 formed on the disk 7 by the offset flange 9 so that the outer faces of the disk 7 and the ring are flush.

A milled ob 13 is secured to the outer face of the csk 7 and is formed with an opening 14 to receive the outer end of the spindle 3, the knob forming suitable means whereby the disk 7 may be rotated. Secured to the inner face'of the flange 5 is an apertured supporting member 15in which is slidably mounted one end of a bolt or' stem 16, the opposite end of the bolt extending through the ring 10. An expansion spring l7 is coiled around the bolt, one end thereof bearing against the supporting plate 15 and the opposite end of the spring bearing against a late 18 which is SGCHXQt'l to the bolt 16 an which is formed on its outer face with a tooth 19 which is adapted to engage with an annular series of teeth 20 formed on the inner face of the olfset flange 9 of the disk 7Q It will be seen that when the bolt 16 is in normal position with the plate l8-engaged with the tooth flange 9 of the disk 7 the disks 4 and 7 can only bolt is moved inwardly so that the plate 18 disconnected from the flange, the disks may be rotated independently of each other.

be rotatedsimultaneously, but when the" the disk 7 are numbered to correspond with the number of days in the month indicated in the sub-divisions in the annular space 23.

To determine the number of days from one date in one month to a certain date in another month, in the space 23, the date in the annular space 22 from which it is desired to count, is set opposite the numeral 1 on the ring 10, and the number in the space on the ring opposite the day of the month to I which it is desired to count will indicate the nular flange rotatably mounted on said spin- 1 number of days between the given dates.

On the outer periphery of the flange 5 is inscribed an interest table 25 for computing interest on one dollar, at difi'erent percentages from 1 to 365 days. The interest for one day is marked in the spaces adjacent the numeral 1 on the outer face of the ring, so that when the number of days from one date to a given date has been found and it is desired to determine the interest on one dollar for that number of days, it is only necessa to look in the s ace showin the required per cent. adjacent the space on the 1 ring showing the number of days.

. From the foregoing it is obvious that the number of days from a date in one month to a certain date in another onth may be guickly and easily determined: and that the evice is composed of a small numbcnof parts whereby it may be cheaply manufactured. It will be seen that the ring 10 limits the outward movement of the disk 7 on the spindle 3, and the plate 8 limits the inward movement of the disk, whereby the lateral movement of the disk motion is prevented.

Having thus fully described our invention what we desired to claim and secure by Letters Patent is:

1. A device of the character described comprising a spindle,-a disk having an-.annular flange rotatably' mounted on said spindle, a second disk rotatably mounted on said spindle within said flange, said second disk being formed with a series of teeth, and means slidably connected to the first mentioned disk and adapted for engagement with s id teeth, whereby independent rotation 0 the disks is prevented, as and for the purpose described.

2. A device of the character described comprising a spindle, a disk having an anin either dipose described.

3. A device of the character described 1 comprising a spindle, a disk having a laterally extending peripheral flange rotatably mounted on said spindle, a second disk ro tatably mounted on said spindle within said flange, a ring secured to the outer edge of said flange, means whereby lateral move ment of said disks is prevented, and means formed on said second for locking engagement with said ring, as and for the purpose described} 4. A device of the character described comprising a spindle, a disk having a laterally extending flange rotatably mounted on said spindle, a mounted on said spindle within said flange, a ring secured to the outer edge of said flange, an inwardly otiset peripheral flange formed on the second disk and adapted to bear against the inner face of said ring, and meansseeured to the flange on the first mentioned disk and adapted for engagement with the flange on the second mentioned disk whereby rotary movement of the disks independent of each other is prevented.

5. A device of the character described comprising a spindle, a disk "rotatably mounted on said spindle, said disk having a transversely extending peripheral flange, a second disk rotatably mounted on said spindle within said flange, a ring secured to the outer edge of said flange, a plate secured to the inner face of said flange near the outer end thereof, and means supported b said plate for engagement with said secon disk,

whereby rotary movement of said disks independent of each other is prevented.

6. A device of the character described comprising a' spindle, a disk rotatably mounted on said spindle, said disk having a transversely xtending peripheral flange, a second disk rotatably mounted on said spindle within said flange, said second disk having an annular series of teeth, and means secured to the first mentioned disk and adapted to engage said teeth in the second mentioned disk whereby rotary movement of said disks independent of each other is prevented.

7. A device of the character described comprising a spindle, a disk rotatably mounted on said spindle, said disk having a transversely extending peripheral flange, a second disk-rotatably mounted on said spindle within said flange, said second disk second rotatably having an annular series of teeth, a plate our signatures in the presence of two witsecured to the lnner face of sand flange, and messes.

means slidably suppeeted in said plate for ADOLPH H. C. HORNBQSTEL. engagement with said series of teeth where- JAMES H. CROSWHITE. 5 by rotary movement of said disks independ- Witnesses:

ent of each other is prevented, C. H. PETERS,

In testimony whereef We hereunto afiix B. K. NIEDERJOHN. 

